bridge: mcast: Expose __br_multicast_del_group_src()

Expose __br_multicast_del_group_src() which is symmetric to
br_multicast_new_group_src() and does not remove the installed {S, G}
forwarding entry, unlike br_multicast_del_group_src().

The function will be used in the error path when user space was able to
add a new source entry, but failed to install a corresponding forwarding
entry.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/bridge/br_multicast.c

@@ -650,18 +650,23 @@ static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
 	kfree_rcu(src, rcu);
 }
 
-void br_multicast_del_group_src(struct net_bridge_group_src *src,
-				bool fastleave)
+void __br_multicast_del_group_src(struct net_bridge_group_src *src)
 {
 	struct net_bridge *br = src->pg->key.port->br;
 
-	br_multicast_fwd_src_remove(src, fastleave);
 	hlist_del_init_rcu(&src->node);
 	src->pg->src_ents--;
 	hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
 	queue_work(system_long_wq, &br->mcast_gc_work);
 }
 
+void br_multicast_del_group_src(struct net_bridge_group_src *src,
+				bool fastleave)
+{
+	br_multicast_fwd_src_remove(src, fastleave);
+	__br_multicast_del_group_src(src);
+}
+
 static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
 {
 	struct net_bridge_port_group *pg;

net/bridge/br_private.h

@@ -977,6 +977,7 @@ br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip);
 struct net_bridge_group_src *
 br_multicast_new_group_src(struct net_bridge_port_group *pg,
 			   struct br_ip *src_ip);
+void __br_multicast_del_group_src(struct net_bridge_group_src *src);
 void br_multicast_del_group_src(struct net_bridge_group_src *src,
 				bool fastleave);
 void br_multicast_ctx_init(struct net_bridge *br,